EWCM but negative OPK

Today is CD10 and I have EWCM. Last month I finally charted BBT and used OPKs and learned that I actually ovulate much later than my CM would indicate, CD20 to be exact. Last cycle my EWCM came around this time and then I had the creamy cm around O. Is something wrong with my since my CM and O do not coincide? I've been using Astroglide TTC (preseed equivalent) to combat this but wondering if I need to see my Dr. about this.